package netytest;

import org.apache.log4j.Logger;  
import io.netty.bootstrap.ServerBootstrap;  
import io.netty.channel.ChannelInitializer;  
import io.netty.channel.ChannelPipeline;  
import io.netty.channel.EventLoopGroup;  
import io.netty.channel.nio.NioEventLoopGroup;  
import io.netty.channel.socket.SocketChannel;  
import io.netty.channel.socket.nio.NioServerSocketChannel;  
import io.netty.handler.codec.LengthFieldBasedFrameDecoder;  
import io.netty.handler.codec.LengthFieldPrepender;  
import io.netty.handler.codec.string.StringDecoder;  
import io.netty.handler.codec.string.StringEncoder;  
import io.netty.util.CharsetUtil;  

public class TcpServer {  
	  
    private static final Logger logger = Logger.getLogger(TcpServer.class);  
    private static final String IP = "127.0.0.1";  
    private static final int PORT = 5679;  
    /**用于分配处理业务线程的线程组个数 */  
    protected static final int BIZGROUPSIZE = Runtime.getRuntime().availableProcessors()*2; //默认  
    /** 业务出现线程大小*/  
    protected static final int BIZTHREADSIZE = 4;  
        /* 
     * NioEventLoopGroup实际上就是个线程池, 
     * NioEventLoopGroup在后台启动了n个NioEventLoop来处理Channel事件, 
     * 每一个NioEventLoop负责处理m个Channel, 
     * NioEventLoopGroup从NioEventLoop数组里挨个取出NioEventLoop来处理Channel 
     */  
    private static final EventLoopGroup bossGroup = new NioEventLoopGroup(BIZGROUPSIZE);  
    private static final EventLoopGroup workerGroup = new NioEventLoopGroup(BIZTHREADSIZE);  
      
    protected static void run() throws Exception {  
        ServerBootstrap b = new ServerBootstrap();  
        b.group(bossGroup, workerGroup);  
        b.channel(NioServerSocketChannel.class);  
        b.childHandler(new ChannelInitializer<SocketChannel>() {  
            @Override  
            public void initChannel(SocketChannel ch) throws Exception {  
                ChannelPipeline pipeline = ch.pipeline();  
                pipeline.addLast("frameDecoder", new LengthFieldBasedFrameDecoder(Integer.MAX_VALUE, 0, 4, 0, 4));  
                pipeline.addLast("frameEncoder", new LengthFieldPrepender(4));  
                pipeline.addLast("decoder", new StringDecoder(CharsetUtil.UTF_8));  
                pipeline.addLast("encoder", new StringEncoder(CharsetUtil.UTF_8));  
                pipeline.addLast(new TcpServerHandler());  
            }  
        });  
  
        b.bind(IP, PORT).sync();  
        System.out.println("TCP服务器已启动");  
    }  
      
    protected static void shutdown() {  
        workerGroup.shutdownGracefully();  
        bossGroup.shutdownGracefully();  
    }  
  
    public static void main(String[] args) throws Exception {  
    	System.out.println("开始启动TCP服务器...");  
        TcpServer.run();  
//      TcpServer.shutdown();  
    }  
}  
